THE ANITA COSMOGENIC NEUTRINO EXPERIMENT

2006 ◽  
Vol 21 (supp01) ◽  
pp. 158-162
Author(s):  
◽  
PETER W. GORHAM
Keyword(s):  
Neutrino Experiment ◽  
Long Duration ◽  
Cosmic Neutrino ◽  
Antarctic Impulsive Transient Antenna ◽  
Neutrino Fluxes ◽  
The Antarctic

We report on new limits on cosmic neutrino fluxes from the flight of the Antarctic Impulsive Transient Antenna (ANITA) prototype, dubbed ANITA-lite, which completed an 18.4 day flight of a long-duration balloon (LDB) payload in early 2004.

scholarly journals Constraints on Cosmic Neutrino Fluxes from the Antarctic Impulsive Transient Antenna Experiment

2006 ◽  
Vol 96 (17) ◽  
Author(s):  
S. W. Barwick ◽  
J. J. Beatty ◽  
D. Z. Besson ◽  
W. R. Binns ◽  
B. Cai ◽  
...  
Keyword(s):  
Cosmic Neutrino ◽  
Antarctic Impulsive Transient Antenna ◽  
Neutrino Fluxes ◽  
The Antarctic

scholarly journals Results from the third flight of ANITA

2019 ◽  
Vol 216 ◽  
pp. 01009
Author(s):  
Abigail Vieregg
Keyword(s):  
Cosmic Rays ◽  
Radio Emission ◽  
High Energy ◽  
Neutrino Interaction ◽  
Air Showers ◽  
The Third ◽  
Long Duration ◽  
Antarctic Impulsive Transient Antenna ◽  
Ultra High Energy Neutrinos ◽  
The Antarctic

We summarize results from the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload that searches for radio emission from the interactions of ultra-high-energy neutrinos and cosmic rays. ANITAIII was launched in December 2014 and flew for 22 days. We report the results from multipleanalyses of the data, which search for Askaryan radio emission from neutrinos interacting in the Antarctic ice as well as geomagnetic radio emission from extensive air showers (EASs) induced by cosmic rays or a tau lepton created in an in-earth tau neutrino interaction. In the most sensitive Askaryan neutrino search, we find one eventon a pre-unblinding background of 0:7−0:3+0.5. Across all searches, including a dedicated EAS search, we find a total of 28 EAS-like events. One of these events is consistent with an upward-traveling EAS, with a post-unblinding background estimate of ⪷10−2.

RESULTS FROM THE ANITA EXPERIMENT

2007 ◽  
Vol 22 (30) ◽  
pp. 2237-2246 ◽  
Author(s):  
◽  
ANDREA SILVESTRI ◽  
S. W. BARWICK ◽  
J. J. BEATTY ◽  
D. Z. BESSON ◽  
...  
Keyword(s):  
Neutrino Flux ◽  
High Energy ◽  
Long Duration ◽  
Order Of Magnitude ◽  
Successful Launch ◽  
Balloon Experiment ◽  
Antarctic Continent ◽  
The Antarctic ◽  
Prototype Instrument ◽  
Better Than

The ANtarctic Impulse Transient Antenna (ANITA) is the first long-duration balloon experiment designed to search and measure the flux of Greisen–Zapsepin–Kuzmin (GZK) neutrinos. We present new limits on neutrinos fluxes of astronomical origin from data collected with the successful launch of a 2-antenna prototype instrument, called ANITA-lite, that circled the Antarctic continent for 18.4 days in January 2004. We performed a search for Ultra-High-Energy (UHE) neutrinos with energies above 3 × 1018 eV . No excess events above the background expectation were observed and a neutrino flux following E-2 spectrum for all neutrino flavors, is limited to [Formula: see text] for 1018.5 eV < Eν < 1023.5 eV at 90% confidence level. The launch of ANITA is scheduled for December 2006. Looking beyond ANITA, we describe a new idea, called ARIANNA (Antarctic Ross Iceshelf ANtenna Neutrino Array), to increase the sensitivity for GZK neutrinos by one order of magnitude better than ANITA.

PRELIMINARY RESULT FROM ANITA EXPERIMENT

2008 ◽  
Vol 23 (17n20) ◽  
pp. 1419-1430 ◽  
Author(s):  
◽  
JIWOO NAM ◽  
P. W. Gorham ◽  
S. W. Barwick ◽  
J. J. Beatty ◽  
...  
Keyword(s):  
Broad Band ◽  
Austral Summer ◽  
Neutrino Telescope ◽  
Horn Antennas ◽  
Preliminary Results ◽  
Astrophysical Neutrinos ◽  
Antarctic Impulsive Transient Antenna ◽  
The Antarctic

The ANITA (ANtarctic Impulsive Transient Antenna) experiment is a balloon-borne neutrino telescope which consists of an array of 32 broad-band horn antennas. It successfully completed a 35 day flight over Antarctica during the 2006-2007 austral summer. The primary goal of ANITA is to search for astrophysical neutrinos with energies E > 1019eV by detecting radio Cherenkov signals from neutrino induced showers in the Antarctic ice. We present preliminary results from ongoing analyses of ANITA data.

scholarly journals Stratéole/Vorcore—Long-duration, Superpressure Balloons to Study the Antarctic Lower Stratosphere during the 2005 Winter

2007 ◽  
Vol 24 (12) ◽  
pp. 2048-2061 ◽  
Author(s):  
Albert Hertzog ◽  
Philippe Cocquerez ◽  
René Guilbon ◽  
Jean-Noël Valdivia ◽  
Stéphanie Venel ◽  
...  
Keyword(s):  
Lower Stratosphere ◽  
Vortex Breakdown ◽  
Polar Vortex ◽  
Summer Circulation ◽  
Stratospheric Polar Vortex ◽  
Long Duration ◽  
Independent Observations ◽  
Lagrangian Tracers ◽  
The Antarctic ◽  
Gps Observations

Abstract In September and October 2005, the Stratéole/Vorcore campaign flew 27 superpressure balloons from McMurdo, Antarctica, into the stratospheric polar vortex. Long-duration flights were successfully achieved, 16 of those flights lasting for more than 2 months. Most flights were terminated because they flew out of the authorized flight domain or because of energy shortage in the gondola. The atmospheric pressure (1-Pa precision) was measured every minute during the flights, whereas air temperature observations (0.25-K accuracy) and balloon positions (absolute GPS observations, 10-m accuracy) were obtained every 15 min. Fifteen-minute-averaged horizontal velocities of the wind were deduced from the successive balloon positions with a corresponding accuracy ≲0.1 m s−1. The collected dataset (more than 150 000 independent observations) provides a thorough high-resolution sampling of the polar lower stratosphere in the Southern Hemisphere from its wintertime state up to the establishment of the summer circulation in December–January. Most of the balloons stayed inside the vortex until its final breakdown, although a few were ejected toward the midlatitudes in November during filamention events associated with an increase in planetary wave activity. The balloons behaved as quasi-Lagrangian tracers during the first part of the campaign (quiescent vortex) and after the vortex breakdown in early December. Large-amplitude mountain gravity waves were detected over the Antarctic Peninsula and caused one flight termination associated with the sudden burst in the balloon superpressure.

scholarly journals Reflections on the anomalous ANITA events: the Antarctic subsurface as a possible explanation

2020 ◽  
Vol 61 (81) ◽  
pp. 92-98 ◽  
Author(s):  
Ian M. Shoemaker ◽  
Alexander Kusenko ◽  
Peter Kuipers Munneke ◽  
Andrew Romero-Wolf ◽  
Dustin M. Schroeder ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Cosmic Ray ◽  
High Energy ◽  
Air Showers ◽  
Radio Signals ◽  
Subsurface Layers ◽  
Balloon Experiment ◽  
Antarctic Impulsive Transient Antenna ◽  
Sole Criterion ◽  
The Antarctic

AbstractThe Antarctic Impulsive Transient Antenna (ANITA) balloon experiment was designed to detect radio signals initiated by high-energy neutrinos and cosmic ray (CR) air showers. These signals are typically discriminated by the polarization and phase inversions of the radio signal. The reflected signal from CRs suffer phase inversion compared to a direct ‘tau neutrino’ event. In this paper, we study subsurface reflection, which can occur without phase inversion, in the context of the two anomalous up-going events reported by ANITA. It is found that subsurface layers and firn density inversions may plausibly account for the events, while ice fabric layers and wind ablation crusts could also play a role. This hypothesis can be tested with radar surveying of the Antarctic region in the vicinity of the anomalous ANITA events. Future experiments should not use phase inversion as a sole criterion to discriminate between down-going and up-going events, unless the subsurface reflection properties are well understood.

scholarly journals Systematic parameter space study for the UHECR origin from GRBs in models with multiple internal shocks

2020 ◽  
Vol 498 (4) ◽  
pp. 5990-6004 ◽  
Author(s):  
J Heinze ◽  
D Biehl ◽  
A Fedynitch ◽  
D Boncioli ◽  
A Rudolph ◽  
...  
Keyword(s):  
Parameter Space ◽  
Gamma Ray ◽  
Ultrahigh Energy ◽  
Long Duration ◽  
Internal Shock ◽  
Wide Range ◽  
Multiple Collisions ◽  
To Come ◽  
Neutrino Fluxes ◽  
Comparable Quality

ABSTRACT We scrutinize the paradigm that conventional long-duration gamma-ray bursts (GRBs) are the dominant source of the ultrahigh energy cosmic rays (UHECRs) within the internal shock scenario by describing UHECR spectrum and composition and by studying the predicted (source and cosmogenic) neutrino fluxes. Since it has been demonstrated that the stacking searches for astrophysical GRB neutrinos strongly constrain the parameter space in single-zone models, we focus on the dynamics of multiple collisions for which different messengers are expected to come from different regions of the same object. We propose a model that can describe both stochastic and deterministic engines, which we study in a systematic way. We find that GRBs can indeed describe the UHECRs for a wide range of different model assumptions with comparable quality albeit with the previously known problematic energy requirements; the heavy mass fraction at injection is found to be larger than 70 per cent ($95 {{\ \rm per\ cent}}$ CL). We demonstrate that the post-dicted (from UHECR data) neutrino fluxes from sources and UHECR propagation are indeed below the current sensitivities but will be reached by the next generation of experiments. We finally critically review the required source energetics with the specific examples found in this study.

scholarly journals First quasi-Lagrangian in-situ measurements of Antarctic Polar springtime ozone: observed ozone loss rates from the Concordiasi long-duration balloon campaign

2014 ◽  
Vol 14 (16) ◽  
pp. 22245-22272
Author(s):  
R. Schofield ◽  
L. M. Avallone ◽  
L. E. Kalnajs ◽  
A. Hertzog ◽  
I. Wohltmann ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Austral Spring ◽  
Ozone Loss ◽  
Long Duration ◽  
Rate Maximum ◽  
Stratospheric Balloon ◽  
Temporal And Spatial ◽  
The Antarctic ◽  
Loss Rates

Abstract. We present ozone measurements made using state-of-the-art ultraviolet photometers onboard three long-duration stratospheric balloons launched as part of the Concordiasi campaign in austral spring 2010. Ozone loss rates calculated by matching air-parcels sampled at different times and places during the polar spring are in agreement with rates previously derived from ozonesonde measurements, for the vortex-average, ranging between 2–7 ppbv (sunlit h)−1 or 25–110 ppbv per day. However, the geographical coverage of these long-duration stratospheric balloon platforms provides new insights into the temporal and spatial patterns of ozone loss over Antarctica. Very large ozone loss rates of up to 200 ppbv day−1 (16 ppbv (sunlit h)−1) are observed for airmasses that are down-wind of the Antarctic Peninsula and/or over the East Antarctic region. The ozone loss rate maximum downstream of the Antarctic Peninsula region is consistent with high PSC occurrence from Calipso and large ClO abundances from MLS satellite observations for 12–22 September 2010.

scholarly journals First quasi-Lagrangian in situ measurements of Antarctic Polar springtime ozone: observed ozone loss rates from the Concordiasi long-duration balloon campaign

2015 ◽  
Vol 15 (5) ◽  
pp. 2463-2472 ◽  
Author(s):  
R. Schofield ◽  
L. M. Avallone ◽  
L. E. Kalnajs ◽  
A. Hertzog ◽  
I. Wohltmann ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Model Simulation ◽  
Austral Spring ◽  
Air Masses ◽  
Ozone Loss ◽  
Long Duration ◽  
Rate Maximum ◽  
Stratospheric Balloon ◽  
The Antarctic ◽  
Loss Rates

Abstract. We present ozone measurements made using state-of-the-art ultraviolet photometers onboard three long-duration stratospheric balloons launched as part of the Concordiasi campaign in austral spring 2010. Ozone loss rates calculated by matching air parcels sampled at different times and places during the polar spring are in agreement with rates previously derived from ozonesonde measurements, for the vortex average, ranging between 2 and 7 ppbv per sunlit hour or between 25 and 110 ppbv per day. However, the geographical coverage of these long-duration stratospheric balloon platforms provides new insights into the temporal and spatial patterns of ozone loss over Antarctica. Very large ozone loss rates of up to 230 ppbv per day (16 ppbv per sunlit hour) are observed for air masses that are downwind of the Antarctic Peninsula and/or over the East Antarctic region. The ozone loss rate maximum downstream of the Antarctic Peninsula region is consistent with high PSC occurrence from CALIPSO and large ClO abundances from MLS satellite observations for 12–22 September 2010, and with a chemical box model simulation using JPL 2011 kinetics with full chlorine activation.

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